package com.situ.mall.manager.mapper;

import com.situ.mall.manager.entity.Category;
import org.apache.ibatis.annotations.*;

import java.util.List;


@Mapper //MyBatis的注解，是MyBatis的接口，相当于Application的MapperScan注解
public interface CategoryMapper {
    /**
     * 插入数据表的操作
     * 1.返回值类型:int
     * 2.方法名: insert
     * 3.参数: Category
     * 4.配置:使用@Insert的注解配置SQL语句
     */
    @Insert({"insert into category",
            "(name,dscp,pic,parent_id,recom)",
            "value(#{name},#{dscp},#{pic},#{parentId},#{recom})",
        })
    @Options(useGeneratedKeys = true, keyColumn = "id", keyProperty = "id")
    int insert(Category category);

    /**
     * 根据ID删除
     */
    @Delete("delete from category where id=#{id}")
    int delete(Integer id);

    /**
     * 根据ID更新,使用动态SQL,需要为SQL添加<script></script>
     */
    @Update({"<script>",
            "update category",
            "<set>",
            "<if test='name != null and name.length>0'> name=#{name},</if>",
            "<if test='dscp != null and dscp.length>0'> dscp=#{dscp},</if>",
            "<if test='pic != null and pic.length>0'> pic=#{pic},</if>",
            //判断参数category的parentId属性不为空
            //设置数据表的parent_id字段为参数category的parentId属性
            "<if test='parentId != null'> parent_id=#{parentId},</if>",
            "<if test='recom != null'> recom=#{recom}</if>",
            "</set>",
            "where id=#{id}",
            "</script>",

    })
    int update(Category category);

    /**
     * 根据ID查询
     */
    @Select("select * from category where id=#{id}")
    Category selectById(Integer id);

    /**
     * 通用的多条件的组合查询
     */
    @Select({"<script>",
            "select * from category",
            "<where>",
            "<if test='name != null and name.length>0'>name like '%${name}%'</if>",
            "<if test='parentId != null and parentId != 0'> and parent_id = #{parentId}</if>",
            "<if test='parentId != null and parentId == 0'> and parent_id is null</if>",
            "<if test='recom != null'>and recom = #{recom}</if>",
            "<if test='status != null'>and status = #{status}</if>",
            "</where>",
            "</script>"

    })
    @Results({  //相当于result map标签
            @Result(column = "parent_id",property = "parentId"),
            @Result(column = "parent_id",property = "parent",
            one=@One(select = "selectById"))   //相当于result id和result标签

    })
    List<Category> select(Category category);
}
